REFLECTOR: From IVO

[Al Gietzen]

Subject: Re: REFLECTOR: From IVO

 

Unfortunately, a spring damper would introduce its own harmonic envelope 

and might get you INTO a lot more trouble than it gets you OUT OF.

 

Just a theory .... Jim S.

 

Yeah; it's resonance frequencies that break things.  Putting in a spring
doesn't absorb any energy, but it does 'soften' the system, thereby lowering
the frequency of any resonance that may occur.  If it lowers it out of the
operating range you're home free.  If the resonance was initially out of the
high end of the range, things could get worse. The spring systems on vehicle
clutches serve keep resonance below the operating range.

 

Al

 

 

Brian Michalk wrote:

 

>What about some sort of mechanism like what is found on clutch plates?

>It's very lightweight, and couples several hundreds(for trucks) of

>horsepower through four or so springs from the splined transmission shaft
to

>the clutch pads.

>

>Slip it in between a standard SAE ARP502 prop pad, and the corresponding

>prop.

>

>Don't need the pads.  I'll bet the one from my Dodge weighs less than five

>lbs with the pads.

>At least there would be no heat (not much anyway), because this wouldn't be

>a damper (like a fluid filled shock absorber).

>

>Only thing is that the automotive design is strictly shear.  A prop design

>would have to handle thrust loads, which would require a thrust bearing if

>one wanted to keep the friction temperatures down.

>

>

>  

>

>>Brian; that is very interesting.  The viscous damper is the best type of

>>damper for torsional vibration, and eliminating resonance.  To be most

>>effective, it could be "tuned" to a specific engine-prop

>>combination; but in

>>any case, cold make a large difference in pulse stress transmitted to the

>>prop. Maybe with one of these on a Lyc the IVO would work there also?

>>

>>Al

>>

>>

>>    

>>

>

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